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US 5,350,810 AGranted
Polyester-arcylic graft polymers for use in powder coatings
AssigneeFerro Corporation
InventorsHenry J. DeGraaf, Susan M. Sobek
Life of this patent
Estimating the term…
Abstract
A thermosetting powder paint coating containing a polymeric binder comprising a polyester graft acrylic copolymer and a low molecular weight crystalline polyester. The coatings can be pigmented or non-pigmented. The polyester-graft-acrylic copolymer can be self-crosslinking by the inclusion of beta-hydroxy ester groups or crosslinked by an external crosslinker.
Claims7
A thermosetting powder paint coating composition containing a coreactive crosslinker and a polymeric binder comprising on a weight basis:
- between 55% and 95% of a polyester-graft-acrylic copolymer produced by producing a hydroxyl or carboxyl functional low molecular weight polyester prepolymer comprising dodecanedioic acid esterified with glycol, then reacting the polyester prepolymer with an oxirane functional ethylenic monomer to produce a polyester intermediate polymer containing pendant double bonds followed by in-situ copolymerization with ethylenically unsaturated monomers including acrylic monomers to produce said polyester-graft-acrylic copolymer;
- between 5% and 45% of a low molecular weight crystalline polyester produced by esterifyinga symmetrical glycol with a symmetrical aromatic dicarboxylic acid having from 6 to 12 even numbered carbon atoms.
Dependencies are inferred from the claim text.